Dual Color (White/Red) Lights from LED Lenser
-or-
How to See in the Dark Without Destroying Your Night Vision

By the chuckhawks.com staff

One of the key items in every amateur astronomer's kit
(professionals, too!) is a red lens flashlight. It is a fact that our eye's
dark adaptation is less affected by red light than by any other color and if
you are going to see stars at night, your eyes need to be fully dark adapted.
Other outdoorsmen, such as campers and hunters, face a similar problem at night.

The advent of red LED flashlights has made the old red
flashlight lens (often homemade from a #25A photographic filter, red cellophane
or something similar) obsolete. LED flashlights have sparked a revolution in
hand portable lighting and nowhere is this more evident than in LED lights with
multiple color LED's, usually red and white or red, blue and white. A selector
switch lets you choose the color of the LED and thus the color of the light.

Recently, in the course of reviewing a number of modern,
high tech flashlights, we were particularly impressed by LED Lenser lights. LED
Lenser is a product and brand of Zweibrueder Optoelectronics, Solingen,
Germany, although the lights reviewed here were actually manufactured in Red
China. When we conceived the notion of reviewing a couple of red LED
flashlights, we first thought of the LED Lenser brand. Our friends at Coast
Products in Portland, Oregon, USA are the exclusive importers of LED Lenser
lights for both North and South America. They kindly supplied the flashlights
that are the subject of this review.

LED Lenser flashlights are the brightest lights on the
market. This is achieved by LED Lenser patented reflector systems, top quality
LED's, and Power Transformation Technology that uses a microprocessor to
digitally increase the voltage supplied to the LED and regulate the current at
the same time. The electrical contacts are 24-karat gold plated. The three main
components (light head, main tube and tailpiece) of LED Lenser flashlights are
machined from heavy-duty aluminum and O-ring sealed at both bezel and tail
piece for protection against the entry of dust and moisture. The main body of
the tube is checkered in a fine, flat-topped pattern for a secure grip.

The LED Lenser flashlights provided for this review include
the Model 7736D Dual Color Tactical flashlight, Model 1106 Dual Color General
Use flashlight and the Model 1065 Dual Color Headlamp. In each, the "dual
color" designation refers to the presence of a red LED and multiple white
LED's in the light's reflector. In each light, the red LED is in the center of
the V2 six-chip reflector, surrounded by a circular array (cloverleaf) of five
white LED's. These LED's are extremely durable and will provide up to 100,000
hours of light without replacement.

The Model 7736D Tactical light is both smaller and brighter
than the Model 1106. Its five white LED's can pump out 100 lumens for up to 50
hours. That is a lot of light from a body only 3.75 inches long. It is
cylindrical in shape and one-inch in diameter; there is no flare to the bezel.
Like all of the LED Lenser lights we have reviewed, it is built like a tank
with a body machined from heavy-duty aluminum and sealed against the intrusion
of moisture. The body of the case is extensively checkered in a very fine,
flat-topped pattern. The Model 7736D is supplied with a nylon pouch case with a
belt loop, wrist strap and a small snap shackle. It runs on three AAA batteries
(supplied), which are installed from the front by unscrewing the bezel. The
2009 online retail price is $40.

There are two on/off push buttons, located on opposite sides
of the flashlight body behind the bezel. One is black and matches the body
color of the flashlight (for the five white LED's) and one is red (for the
single red LED). Either button can be used singly, or both the red and white
LED's can be turned on together. This simple, easily understood system
eliminates the confusion of a multi-function switch.

The only drawback to the dual on/off, color-coded button
system is that in the field on a dark night, the buttons must be operated by
touch, which means that the color-coding cannot be seen. There is then the
possibility of accidentally switching-on the white light instead of the red
light. This will not win many friends at a star party! The black (white light)
button is very lightly checkered to create a tactile difference, but the
checkering is so shallow that it is difficult to feel. Our suggestion is to
make the checkering deeper and sharper for easier recognition. As it stands
now, we found that scratching the top of the buttons with a fingernail was the
easiest way to tell the checkered black button from the smooth red button in
the dark.

This is a great light, very bright in white light mode and
very easy to carry around due to its small size. Its red LED beam is noticeably
brighter than the Model 1106, which would ordinarily be a good thing, but is
not in the context of preserving night vision. For the amateur astronomer, it
would be desirable to tone down the red light output. Perhaps a spot of
fingernail polish or red lacquer over the center, red LED would do the trick.
For the hunter tracking at night, its brightness is probably about right as
supplied. You can see the LED Lenser tactical light line at
www.ledlenserusa.com

LED Lenser Model 1106 Flashlight

LED Lenser #1106 flashlight. Illustration courtesy of Coast Cutlery.

The Model 1106 General Use flashlight, although not actually
large, is the biggest of the three lights we tested. It is a medium-small light
with a heavy duty, black anodized, machined aluminum case that is 6.25"
long and about 1.4" in bezel diameter. It is smaller than a conventional
two C-cell flashlight. The case body is extensively covered by fine,
flat-topped checkering for a secure grip. The Model 1106 runs on a cluster of
three AAA batteries. They provide up to 118 hours of run time, which is about
ten times the run time of a light with a conventional incandescent bulb. The
maximum light output is 62 lumens, or around twice the brightness of a typical two C-cell flashlight with a
halogen bulb. The 2009 online retail price is about $30.

As with the Model 7736D, there are two on/off buttons on
opposite sides of the lights body, one red (for the red LED) and one black (for
the five white LED's in the V2 reflector). The comments in the 7736D section
(above) about tactile identification of the buttons when it is dark apply
equally to the 1106.

The Model 1106 is a neat flashlight, slender enough to be
slipped into a hip or jacket pocket and large enough not to be easily
misplaced. Its white light output is plenty bright enough to allow setting-up a
telescope or a camp site at night and its red light, while more than adequately
bright, is not as damaging to night vision as the Model 7736D.

LED Lenser Model 1065 Dual Color Headlamp

LED Lenser 1065 Headlamp. Illustration courtesy of Coast Cutlery.

The Model 1065 Headlamp positions a 22 Lumen light head
incorporating five white LED's and one red LED in a silver metal bezel on an
elastic, adjustable headband. The plastic light head upon which the bezel is
mounted is hinged at the bottom so that the direction of the light can be
adjusted straight ahead or pointed down at any angle desired for map reading or
other close work at night. A separate battery pack at the rear of the headband
holds the three AAA-cells that power the unit and incorporates a rheostat to
reduce the light output, an excellent feature. The package includes a small Neoprene
carry pouch. The 2009 online retail price is about $40.

Six high-intensity LED's (one red and five white) are
mounted in the same sort of cloverleaf reflector system used in the LED Lenser
flashlights reviewed above. The three AAA alkaline batteries provide up to 115
hours of light, thanks to the high output LED's, which are some 10 times more
energy efficient than conventional headlamps. The bright white light is visible
for 2000 yards with the dimmer set to full output, while the red LED preserves
nighttime dark adaptation, especially with the dimmer turned all the way down.

The Model 1065 Headlamp is comfortable to wear and very
convenient to use. As worn normally, the button for the white LED's is on top
of the bezel and the button for the red LED is on the bottom. None of us on the chuckhawks.com
staff is accustomed to wearing a headband, but we all easily accommodated to the Model 1065.

Field Testing

We field tested the three LED Lenser Dual Color lights at an Astronomy and Photography Information Guide
star party at a dark sky site in the foothills of Oregon's Cascade Mountains.
Once we had parked the vehicles, set-up the telescopes and shut down the
lights, it was very dark! At a telescope star party, once the white lights have
been shut off to allow the participants' eyes to become dark adapted, no further
use of white light is allowed. Only red light flashlights are permitted, in
order to preserve night vision. It takes about 45 minutes for human eyes to
become fully dark adapted, so switching-on a bright white light that destroys
this patiently awaited night vision elicits a chorus of groans.

Spend a whole night out in the hills under the stars, in
this case with no moon, and your red flashlight gets a lot of use. Visual
astronomers are constantly adjusting mounts or slow motion controls, aligning
their telescopes on new objects, changing eyepieces, reading star maps, jotting
notes in their journals, trying to find where they set their eyeglasses, or
their water bottle, or the thermos of hot coffee and so forth. All of this is
done by (hopefully) dim red light.

We hooked the Model 7736D's wrist strap to the supplied snap
shackle and clipped the shackle to the belt loop on the case. This allowed us
to hang the case, with flashlight inside, from one of our telescope's knobs using the wrist strap,
easy to locate in the dark and ready for use.

In use, the 7736D worked great, but as mentioned above its
red LED is really too bright. As a temporary expedient, we toned it down a bit
by blackening the top of the red LED with a Sharpie marker. We will find a more
permanent solution before the next star party. The 7736D's small size makes it
very convenient to use, or to drop in a shirt pocket when not in use.

At the end of our star party, its very bright white light
was useful when putting away the telescopes. The LED Lenser patented V2 cloverleaf
LED arrangement creates a bright center spot with a dim, but wide, surround. At
the end of the night, Managing Editor Chuck Hawks slipped the 7736D into his
telescope kit and it has not been seen since.

Although not a big flashlight, the Model 1106 is larger than
the Model 7736D. This worked somewhat to its advantage, as it is harder to
misplace in the dark, yet the handle will still fit in a pants pocket, or a
jacket pocket. Overall, it did a fine job. Its five white LED's provided plenty
of light for setting-op and breaking-down the telescopes. The illumination
pattern is similar to that of the Model 7736D, as it uses the same V2 cloverleaf
LED configuration.

The Model 1106's red LED is not quite as bright as the Model
7736, which is good. Staff member and telescope owner Bob Fleck glommed onto
the Model 1106 and used it all night. He was very pleased with its performance.
In fact, he refuses to give it back, so we guess it has found a home.

The Model 1065 Headlamp is the most convenient sort of
nighttime light for the amateur astronomer. It puts the red light exactly where
needed for reading star maps, adjusting a telescope mount, changing oculars, writing
notes, etc. and leaves both hands free to accomplish these tasks. With the
dimmer turned all the way down, it was still adequately bright. We wish that
the hand held flashlights had dimmers!

While taking apart the telescopes at the end of the night,
the Headlamp's rheostat was turned up and the white LED's came into play.
Although not as bright as the LED Lenser hand held flashlights, they provided more
than adequate illumination. Staff members Rocky Hays, Gordon Landers and Chuck
Hawks all made good use of the headlamp. They will not be attending future star
parties without one.

The extended run time of all three of these LED Lenser
lights means that you can use them all night, as much as you want, without fear
of battery failure. In fact, the reality is that you can use them several
nights without changing batteries. We carry spare batteries, of course, but it
is nice not to have to fish them out in the middle of the night. Conventional
AA and AAA battery flashlights with a red lens are only good for a couple of
hours use and we have all had incandescent bulbs die, as well as batteries, so
these ultra-reliable LED Lenser lights are a quantum improvement. If you are in
the field at night, for any reason, and need a portable light that gives you
the option of preserving your night vision, you need a Dual Color LED Lenser light.
You can see the entire line-up of LED Lenser lights by visiting the Coast web
site at www.coastportland.com